Intermediate roll for printing-machines.



Patented Dec. 19, 1916.

E MERTENS INIERMEUIATE HULL FOR PHINHNG MA CHINES. APPLICATION rmjn FEB 6. I913. HENEWH) JULY 25. 1915. 1208,815.

J Wen/01: W my M ib n1;

EDUARD MERTENS, OF FREIBURG-IM-BREISGAU, GERMANY.

INTERMEDIATE ROLL FOR PRINTING-MACHINES.

Application filed February 6, 1913, Serial No. 746,588.

To all whom it may concern Be it known that I, EDUARD MnR'rnNs, a subject of the Emperor of Germany, residing at 63 Goethestrasse, F reiburg im- Breisgau, in the Grand Duchy of Baden,

ermany,-have invented new and useful Improved Intermediate Rolls for Printing-Machines, of which the following is a specification.

In my U. S. Patent No. 856,079, I have described elastic intermediate rolls for paper and fabric printing, which rolls are interposed between the printing cylinder and the pressure cylinder, and in which the elastic material is pressed simultaneously during the printing by both cylinders.

In the construction which has hitherto been usual, either the elastic intermediate roll must rotate either the pressure cylinder or the printing surface, if only one of the two are driven, or else the printing cylinder and the pressure cylinder are both driven at the same time. In both cases, the elastic mass is severely strained and is consequently subjected to rapid wear. In the latter case because the speed of rotation of the printing cylinder and the pressure cylinder do not always exactly correspond consequently a strong friction and slipping is caused. Even in the first instance there occurs a slipping of the elastic mass unavoidable because the driving of both shafts cannot be precisely uniform.

The present invention obviates or removes the strong straining and wear of the elastic mass inasmuch as it does not' permit pressure of the pressure disks to act upon the elastic covering of the intermediate roll, but upon the metallic core thereof. The intermediate roll can for this purpose be composed of several parts, which together or singly act upon a single printing roll or several printing rolls which are worked side by side and are placed in the same sheath. The printing surfaces can also be formed of whole or divided printing cylinders or of whole or divided printing plates.

The foregoing which has been said for elastic intermediate rolls with endless web also applies in the use of intermediate rolls such as are described in the German Patent No. 227,818 for intaglio printing. By means of this divided arrangement of the elastic intermediate rolls or rollers with endless web, and also divided webs passing over the pressure rolls, there is attained the advan- Specification of Letters Patent.

Patented Dec. 19, 1916. Renewed July 25, 1916. Serial No. 111,195.

tage, that the intermediate spaces between the intermediate rolls or the webs permit of the application of ribbons, fingers and the like.

The application of the subdivided intermediate roll in paper printing is manifold. Both for illustrations as also for text printing for journals and periodicals, and in both art and working printing, it is always easy to arrange the parts of the intermediate rolls and also the counter-pressure disks in such a manner that the latter work between the pictures or the printing spaces. In the case of newspapers and journals, for in stance four, eight or more pages can be printed at the same time by means of one printing surface. Between the separate pages there is a wide paper margin, which is wide enough to permit of the dividing of the intermediate roll for the work of the counter-pressure rolls. For printing on fabrics, the divided intermediate rolls can be used with advantage for ribbons, cloths, screen materials, giving simultaneous printing upon two webs of material by means of a single printing surface, also for double width materials with a longitudinal cutting line and so forth. The advantage of the subdivided intermediate rolls as over the undivided roll consists moreover as already pointed out in the materially decreased friction, evolution of electricity, and consequently in the diminished Wear on the elastic surface. A further advantage is found in the circumstance that the divisions facilitate the use of bands, gripping fingers and the like such as are necessary for the delivery and taking off mechanisms.

A construction of the apparatus is illus trated diagrammatically in the accompanying drawings, in four figures.

In Figure 1, A indicates the printing surface, B the parts of a counter-pressure intermediate roll placed upon a common shaft D, which parts are pressed against the printing surface by means of the pressure disks D, mounted on the shaft D said disks engaging disks D also mounted on the shaft D. In Fig. 2 separate endless Webs are placed over the intermediate roll rings. The driving, the tension and the pressure are produced by means of disks F, F, and F Instead of the three intermediate rolls illustrated, three rolls could be placed side by side above endless webs pressed against a single pressure roll.

'hat I claim is 1. In a printing apparatus, a printing roll, a shaft supported above the printing roll, counter pressure cylinders carried by said shaft, counter pressure disks supported adjacent the counter pressure cylinders, a shaft supported above the first mentioned shaft, pressure disks carried by the second mentioned shaft, the disks of said shaft adapted to engage the counter pressure disks of the first mentioned shaft for exerting pressure to the shaft thereof and counter pressure cylinders.

2. In a printing apparatus, a printing roll, a shaft supported above the printing roll, counter pressure rolls on the shaft, means engaging the shaft adjacent the counter pressure rolls for communicating presof two subscribed witnesses.

EDUARD MERTENS.

\Vitnesses HENRY HASPER, \VQLDEMAR HAUPT.

Gopie: of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

